Questions for you please about the LL Bean diaper bag.

Is that mesh pocket that I see on the left hand side of the bag big enough for a bottle? What about a sippy cup?
Does the one you own have a contrasting color of liner? Do you think it would fit in the bottom mesh basket of a Maclaren umbrella? Thanks.
Yes and yes about the sippy cup and bottle. Also, there are 2 pockets on the other side...the small one is perfect for a cell phone or paci, the larger one closed and I ususally put my sunglasses in there. Everything is easy access.
There is a tiny, shallow front zipper pocket that is perfect for WDW trips. I keep my room key, DVC card, and AP's in there for quick access for FP.
There is a larger pocket flap that has slots for cc's, etc. I usually just keep a small vera bradley hand clutch in there so if I want to grab it at once I can. There's also a key hook. This pocket isn't huge but it holds a lot if you want it to.
Inside there is a large zip that goes the length of the bag. I put flat things in there (ie. disposable bibs). Plus 3 mesh pockets that are vertical...they could hold bottle too. I use them for: emergency medicine (tylenol drops, benedryl due to allergies), a spare set of clothing, a back-up bottle of Pediasure. I place diapers flat on the bottom of the bag with the wipes. That still leaves room on the end for baby food and snacks as well as my camera and an extra blanket.
It's a completely comfortable bag...slip it off the stroller and onto your shoulder and the wide strap feels great. Even when full it never seems heavy. And your arms are free to deal with the baby.
I have a pretty green one that they don't seem to have anymore. Still, I love this bag!
PS. You won't be able to fit it under a Mac. The only thing I can fit under my Mac is a very small cooler with drinks. Also, if you are going with the Mac, you may want a smaller bag. This hangs over my P3 just fine, but the Mac is a lot more tippy. Something to think about...